Ditch-digging machine.



K. J- NORDBY.

DITCH DIGGING MACHINE.

APPLICATION FILED JAN. 25. I916.

Patented Feb. 25, 1919.

KRISTOFFER. JENSEN NORDBY, 0]? SEM, JARLSBERG, NORWAY.

DITCH-DIGGING MACHINE.

Specification of Letters Patent.

Patented Feb. 25, 1919.

Application filed January 25, 1916. Serial No. 74,170.

To all whom it may concern:

Be it known that I, Knrs'rorrnn JENSEN NORDBY, a subject of the King ofNorway, residing at Sem, Jarlsberg, Norway, have invented certain newand useful Improvements in Ditch-Diggin Machines; and I do herebydeclare the fo lowing to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, and to letters or figures of reference markedthereon, which form a part of this specification.

This invention has for its object to provide an excavator or machine fordigging ditches and consists mainly of a vertically swinging digger,which attacks the end surface of the ditch, and of an inclined conveyer[which takes the dug-earth up from the ditch.

The drawing illustrates in side elevation, the front portion of adigging machine embodying my invention.

The digging device consists of a beam 1 of the same or approximately thesame shape as the cross sectional shape of the ditch to be dug. On thefront side of the beam are provided a plurality of pointed serrated orspade-shaped teeth 2, which form the diggers proper. The beam 1 is heldin a guide 3 in which it may be adjusted Vertically according to thedepth of the ditch to be dug. The beam is held in the guide by means ofbolts 4 threaded through holes 5 in the guide and in the beam 1. Theguide 3 is secured at the top by means of a pivot pin 6 to a crank wheel7 which is put in rotation from the motor (not shown) by means of chains9, 10 and wheels 14, 15, 16 so as to obtain a suitable speed. Both onthe motor and in connection .with one of the chain wheels are providedpowerful fly wheels so as to thoroughly equalize the power.

In connection with the wheel 15 is further arranged a friction coupling11 for cutting the excavator in and out.

The guide 3 is connected below by means of the pivot 12 ,with an arm 17,which is pivotally mounted on a lug 18.

By the rotation of the crank wheel 7 whose radius is shorter than thearms 17, the digging device 1, 2 will therefore perform a swingingmotion, the beam being moved bodily in approximately parallel pathswhereby every point of'the same will move in circular or approximatelycircular paths. It will be understood however that owing to the arm 17being longer than the crank 7 the lower part of the beam will have agreater movement than the upper part in the longitudinal direction ofthe apparatus.

The two wheels 7 and 16- and the arm 17 are mounted on the lugs 18provided on the front of the carriage frame. The latter is connectedabove the front wheel .with a screw-threaded shaft 19 by means of whichit may be adjusted so as to enable of elevating or lowering the wholedigging apparatus relatively to the front wheels in case this benecessary, owing to the configuration of the lands, in order to renderthe bottom of the ditch horizontal. For this purpose a levelingapparatus may be provided at the front of the apparatus so as to enablethe conductor to control .the level from his seat 20.

v The guidance is effected from the drivers seat by means of the hand.wheel 28-, and gears 29, which act upon toothed segment 30 on the frontaxle.

During the digging, the carriage is advanced by suitable drivingmechanism, not shown. The earth to be dug is cut loose by the teeth 2 ofthe digging device and received on a sliding shoe 49 mounted at thelower end of a conveyor 37.

Claim:

In a ditch digging machine, a crank disk 'rotatably mounted on the frontof the machine frame, a guide pivotedly connected at its upper end tosaid disk, a link pivoted at one end on a fixed pivot on the front ofsaid frame below and in rear of the periphery of the crank disk andhaving its free end pivotally connected to the lower end of the guide, adigging bar adjustably In testimony that I claim the foregoing mountedin and extending below the guide, as my invention, I have signed my namein 10 and ad plurellity of superposed cutters presence of twosubscribing Witnesses. mounte on tie bar below the uide the length ofthe link being greatergthari the KRISTOFFER JENSEN NORDBY' radius of thecrank disk, [whereby the paths Witnesses;

of the cutters progressively increase from M. E. GUTTERMSEN,

the guide to the lower end of the bar. C. FABRICIUS HANSEN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of l'atente. Washington, D. G."

